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Gastrointestinal Imaging |
1 From the Department of Radiology, Osaka University Medical School, 2-2 Yamadaoka, Suita-city, Osaka, 565-0871, Japan (T.M., T.K., M.T., M.H., S.T., K.T., K.O., S.K., H.N.); the Department of Radiology, University of Pittsburgh Medical Center, Pittsburgh, Pa (M.P.F.); and GE Yokogawa Medical Systems, Tokyo, Japan (M.K.). Received May 10, 2000; revision requested June 18; revision received July 20; accepted August 29. Address correspondence to T.M. (e-mail: murakami@radiol.med.osaka-u.ac.jp).
PURPOSE: To assess whether double arterial phase imaging with multi–detector row helical computed tomography improves detection of hypervascular hepatocellular carcinoma (HCC).
MATERIALS AND METHODS: Fifty-one patients with 96 hypervascular HCCs underwent double arterial phase imaging of the entire liver. At measured delay after intravenous administration of 2 mL/kg of contrast medium at a rate of 5 mL/sec, the early and late arterial phase images were obtained serially during a single breath hold with interscan delay of 5.0 seconds. Detector row configuration of 2.5 x 4 mm, pitch of 6, and scanning time of 10.5 seconds for each phase were used. Forty 5-mm-thick reconstruction images were obtained for each phase. Each image set was interpreted separately by three observers, who were unaware of tumor burden in the liver, to detect hypervascular HCC. Sensitivity, positive predictive value, and area below the receiver operating characteristic curve (Az) for early and late arterial phases separately and together were calculated.
RESULTS: Mean sensitivity and positive predictive value for hypervascular HCC were 54% and 85% for the early arterial phase, 78% and 83% for the late arterial phase, and 86% and 92% for the double arterial phase, respectively. Double arterial phase imaging showed significantly superior sensitivity compared with early or late arterial phase imaging alone for detecting HCC (P < .05). The mean Az value for double arterial phase was significantly higher than that for early or late arterial phase imaging alone (P < .05). Double arterial phase imaging showed the lowest number of false-positive lesions.
CONCLUSION: Double arterial phase imaging is recommended to improve detection of hypervascular HCCs and reduce false-positive lesions.
Index terms: Computed tomography (CT), helical, 761.12115 • Computed tomography (CT), technology • Liver, CT, 761.12115 • Liver neoplasms, diagnosis, 761.12115, 761.30
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